[gmime] Switch back to running on Precise

[Jeffrey Stedfast <fejj src gnome org>]

commit 63358860d19c5a506b51fc5830e0bd0698604102
Author: Jeffrey Stedfast <jestedfa microsoft com>
Date:   Thu Dec 14 07:12:11 2017 -0500

    Switch back to running on Precise

 .travis.yml |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/.travis.yml b/.travis.yml
index 2c24241..e9cef08 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,4 +1,4 @@
-dist: trusty
+dist: precise
 language: c
 compiler:
   - gcc